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Finding the Fourth Proportional to 639,487.81, 882,495.29 and 353,007.21

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Solution

The fourth proportional to 639,487.81, 882,495.29 and 353,007.21 is: 487,151.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,487.81 : 882,495.29 = 353,007.21 : x
  2. Step 2: Convert to fraction form
    639,487.81/882,495.29 = 353,007.21/x
  3. Step 3: Cross multiply
    639,487.81x = 882,495.29 × 353,007.21
  4. Step 4: Simplify right side
    639,487.81x = 311,527,198,396.01
  5. Step 5: Solve for x
    x = 311,527,198,396.01/639,487.81
  6. Step 6: Final answer
    x = 487,151.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.